X-Git-Url: http://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=test_urcu.c;h=fc9e8b539a9b3a9f21eb05702230602dd760b6d0;hp=ea5a784f785dbf0f57911074fc3dee4f4d906b3f;hb=2a67ec322b40544b9e4fc5f138629a65b4f20352;hpb=87bd15cdb3e77c3d0a616c57ae3876ddea48a54f diff --git a/test_urcu.c b/test_urcu.c index ea5a784..fc9e8b5 100644 --- a/test_urcu.c +++ b/test_urcu.c @@ -5,9 +5,22 @@ * * Copyright February 2009 - Mathieu Desnoyers * - * Distributed under GPLv2 + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ +#define _GNU_SOURCE #include #include #include @@ -18,6 +31,12 @@ #include #include #include +#include + +#include "arch.h" + +/* Make this big enough to include the POWER5+ L3 cacheline size of 256B */ +#define CACHE_LINE_SIZE 4096 #if defined(_syscall0) _syscall0(pid_t, gettid) @@ -34,119 +53,355 @@ static inline pid_t gettid(void) } #endif +#ifndef DYNAMIC_LINK_TEST +#define _LGPL_SOURCE +#else +#define debug_yield_read() +#endif #include "urcu.h" struct test_array { int a; - int b; - char c[200]; }; +static volatile int test_go, test_stop; + +static unsigned long wdelay; + static struct test_array *test_rcu_pointer; -#define NR_READ 10 -#define NR_WRITE 9 +static unsigned long duration; + +/* read-side C.S. duration, in loops */ +static unsigned long rduration; + +static inline void loop_sleep(unsigned long l) +{ + while(l-- != 0) + cpu_relax(); +} + +static int verbose_mode; + +#define printf_verbose(fmt, args...) \ + do { \ + if (verbose_mode) \ + printf(fmt, args); \ + } while (0) + +/* + * returns 0 if test should end. + */ +static int test_duration_write(void) +{ + return !test_stop; +} + +static int test_duration_read(void) +{ + return !test_stop; +} + +static unsigned long long __thread nr_writes; +static unsigned long long __thread nr_reads; + +static unsigned int nr_readers; +static unsigned int nr_writers; + +pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; + +void rcu_copy_mutex_lock(void) +{ + int ret; + ret = pthread_mutex_lock(&rcu_copy_mutex); + if (ret) { + perror("Error in pthread mutex lock"); + exit(-1); + } +} + +void rcu_copy_mutex_unlock(void) +{ + int ret; + + ret = pthread_mutex_unlock(&rcu_copy_mutex); + if (ret) { + perror("Error in pthread mutex unlock"); + exit(-1); + } +} + +/* + * malloc/free are reusing memory areas too quickly, which does not let us + * test races appropriately. Use a large circular array for allocations. + * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail. + */ +#define ARRAY_SIZE (1048576 * nr_writers) +#define ARRAY_POISON 0xDEADBEEF +static int array_index; +static struct test_array *test_array; + +static struct test_array *test_array_alloc(void) +{ + struct test_array *ret; + int index; + + rcu_copy_mutex_lock(); + index = array_index % ARRAY_SIZE; + assert(test_array[index].a == ARRAY_POISON || + test_array[index].a == 0); + ret = &test_array[index]; + array_index++; + if (array_index == ARRAY_SIZE) + array_index = 0; + rcu_copy_mutex_unlock(); + return ret; +} +static void test_array_free(struct test_array *ptr) +{ + if (!ptr) + return; + rcu_copy_mutex_lock(); + ptr->a = ARRAY_POISON; + rcu_copy_mutex_unlock(); +} -void *thr_reader(void *arg) +void *thr_reader(void *_count) { - int qparity, i, j; + unsigned long long *count = _count; struct test_array *local_ptr; - printf("thread %s, thread id : %lx, tid %lu\n", + printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", "reader", pthread_self(), (unsigned long)gettid()); - sleep(2); - - urcu_register_thread(); - - for (i = 0; i < 100000; i++) { - for (j = 0; j < 100000000; j++) { - qparity = rcu_read_lock(); - local_ptr = rcu_dereference(test_rcu_pointer); - if (local_ptr) { - assert(local_ptr->a == 8); - assert(local_ptr->b == 12); - assert(local_ptr->c[55] == 2); - } - rcu_read_unlock(qparity); - } + + rcu_register_thread(); + + while (!test_go) + { } + smp_mb(); - urcu_unregister_thread(); + for (;;) { + rcu_read_lock(); + local_ptr = rcu_dereference(test_rcu_pointer); + debug_yield_read(); + if (local_ptr) + assert(local_ptr->a == 8); + if (unlikely(rduration)) + loop_sleep(rduration); + rcu_read_unlock(); + nr_reads++; + if (unlikely(!test_duration_read())) + break; + } + + rcu_unregister_thread(); + *count = nr_reads; + printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", + "reader", pthread_self(), (unsigned long)gettid()); return ((void*)1); } -void *thr_writer(void *arg) +void *thr_writer(void *_count) { - int i; + unsigned long long *count = _count; struct test_array *new, *old; - printf("thread %s, thread id : %lx, tid %lu\n", + printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", "writer", pthread_self(), (unsigned long)gettid()); - sleep(2); - for (i = 0; i < 10000000; i++) { - new = malloc(sizeof(struct test_array)); - rcu_write_lock(); + while (!test_go) + { + } + smp_mb(); + + for (;;) { + new = test_array_alloc(); + rcu_copy_mutex_lock(); old = test_rcu_pointer; - if (old) { + if (old) assert(old->a == 8); - assert(old->b == 12); - assert(old->c[55] == 2); - } - new->c[55] = 2; - new->b = 12; new->a = 8; - old = urcu_publish_content((void **)&test_rcu_pointer, new); - rcu_write_unlock(); + old = rcu_publish_content(&test_rcu_pointer, new); + rcu_copy_mutex_unlock(); /* can be done after unlock */ - if (old) { + if (old) old->a = 0; - old->b = 0; - old->c[55] = 0; - } - free(old); - usleep(1); + test_array_free(old); + nr_writes++; + if (unlikely(!test_duration_write())) + break; + if (unlikely(wdelay)) + loop_sleep(wdelay); } + printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", + "writer", pthread_self(), (unsigned long)gettid()); + *count = nr_writes; return ((void*)2); } -int main() +void show_usage(int argc, char **argv) +{ + printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); +#ifdef DEBUG_YIELD + printf(" [-r] [-w] (yield reader and/or writer)"); +#endif + printf(" [-d delay] (writer period (us))"); + printf(" [-c duration] (reader C.S. duration (in loops))"); + printf(" [-v] (verbose output)"); + printf(" [-a cpu#] [-a cpu#]... (affinity)"); + printf("\n"); +} + +cpu_set_t affinity; + +int main(int argc, char **argv) { int err; - pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE]; + pthread_t *tid_reader, *tid_writer; void *tret; - int i; + unsigned long long *count_reader, *count_writer; + unsigned long long tot_reads = 0, tot_writes = 0; + int i, a; + int use_affinity = 0; + + if (argc < 4) { + show_usage(argc, argv); + return -1; + } - printf("thread %-6s, thread id : %lx, tid %lu\n", + err = sscanf(argv[1], "%u", &nr_readers); + if (err != 1) { + show_usage(argc, argv); + return -1; + } + + err = sscanf(argv[2], "%u", &nr_writers); + if (err != 1) { + show_usage(argc, argv); + return -1; + } + + err = sscanf(argv[3], "%lu", &duration); + if (err != 1) { + show_usage(argc, argv); + return -1; + } + + CPU_ZERO(&affinity); + + for (i = 4; i < argc; i++) { + if (argv[i][0] != '-') + continue; + switch (argv[i][1]) { +#ifdef DEBUG_YIELD + case 'r': + yield_active |= YIELD_READ; + break; + case 'w': + yield_active |= YIELD_WRITE; + break; +#endif + case 'a': + if (argc < i + 2) { + show_usage(argc, argv); + return -1; + } + a = atoi(argv[++i]); + CPU_SET(a, &affinity); + use_affinity = 1; + printf_verbose("Adding CPU %d affinity\n", a); + break; + case 'c': + if (argc < i + 2) { + show_usage(argc, argv); + return -1; + } + rduration = atol(argv[++i]); + break; + case 'd': + if (argc < i + 2) { + show_usage(argc, argv); + return -1; + } + wdelay = atol(argv[++i]); + break; + case 'v': + verbose_mode = 1; + break; + } + } + + printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", + duration, nr_readers, nr_writers); + printf_verbose("Writer delay : %lu loops.\n", wdelay); + printf_verbose("Reader duration : %lu loops.\n", rduration); + printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", "main", pthread_self(), (unsigned long)gettid()); - for (i = 0; i < NR_READ; i++) { - err = pthread_create(&tid_reader[i], NULL, thr_reader, NULL); + if (use_affinity + && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) { + perror("sched_setaffinity"); + exit(-1); + } + + test_array = malloc(sizeof(*test_array) * ARRAY_SIZE); + tid_reader = malloc(sizeof(*tid_reader) * nr_readers); + tid_writer = malloc(sizeof(*tid_writer) * nr_writers); + count_reader = malloc(sizeof(*count_reader) * nr_readers); + count_writer = malloc(sizeof(*count_writer) * nr_writers); + + for (i = 0; i < nr_readers; i++) { + err = pthread_create(&tid_reader[i], NULL, thr_reader, + &count_reader[i]); if (err != 0) exit(1); } - for (i = 0; i < NR_WRITE; i++) { - err = pthread_create(&tid_writer[i], NULL, thr_writer, NULL); + for (i = 0; i < nr_writers; i++) { + err = pthread_create(&tid_writer[i], NULL, thr_writer, + &count_writer[i]); if (err != 0) exit(1); } - sleep(10); + smp_mb(); + + test_go = 1; + + sleep(duration); - for (i = 0; i < NR_WRITE; i++) { + test_stop = 1; + + for (i = 0; i < nr_readers; i++) { err = pthread_join(tid_reader[i], &tret); if (err != 0) exit(1); + tot_reads += count_reader[i]; } - for (i = 0; i < NR_WRITE; i++) { + for (i = 0; i < nr_writers; i++) { err = pthread_join(tid_writer[i], &tret); if (err != 0) exit(1); + tot_writes += count_writer[i]; } - + + printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, + tot_writes); + printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " + "nr_writers %3u " + "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", + argv[0], duration, nr_readers, rduration, + nr_writers, wdelay, tot_reads, tot_writes, + tot_reads + tot_writes); + test_array_free(test_rcu_pointer); + free(test_array); + free(tid_reader); + free(tid_writer); + free(count_reader); + free(count_writer); return 0; }